Joint protector for sewer pipes



Oct. 7 1924.

F. W. LANG JOINT PROTECTOR FOR SEWER PIPES Filed April 17, 1922 Patented. Oct. 7, 1924.

FREDERICK W. LANG, 0F MINNEAEOLIS, ESOTA..

JOINT PROTECTOR FOR S Y ...n

PIPES.

Application led April 17, 1922. Serial No. 554,141.

T o all whom it myjconcewt:

Be it known thatTI., FREDERICK W. LANG, a citizen of the United States` residing -at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Im rovements in Joint Protectors for Sewer ipes; and I do hereby declare theA following to be a. full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present-invention relates to imp-rovements in joint protectors for sewer pipes of the t pe disclosed and broadly claimed in my U. Letters Patent 1,255,023, issued January 29, 1918, and has for its primary object to simplify the construction thereof and reduce the cost of production.

To the above end, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

To lay sewer pipes, as stated in my above identified patent, it is customary to dig holes in the ground, various distances apart, vand thenconnect the same by digging small tunnels therebetween. On the bottoms of these holes and in the tunnels, the sewer pipe sections are laid. In laying the sewer pipe sections in the tunnel, it is necessary to rst shove one of the pipe sections into the tunnel. A second ipe section is then telescopically connected) to the firstv laid pipe section toform vthe joint therebetween. These two connected ipe sections are then shoved endwise fartlier' into the tunnel. This operation is repeated until a suicient number of pipe sections have been laid.

Cement is placed around the joints between the several pipe sectionsY 1n an attempt to make the vsame waterproof. To get the cement around the joints of the pipe sections coming in the tunnels, it is necessary to place the same around the joints as the vpi e sections are connected and shoved en wisel into the tunnel. This cement very often drops olf or is dislodged before the pipe sections reach theirlinal resting place. The settling ofthe ground also very often cracks and .dislodgesi cementy around the joints, thereby rendering the ysame faulty. These faulty joints not only leak water but rmit the roots oftrees .in their search or moisture, to grow and work their way between the joints of the pipe sections, so that finally the sewer pipe becomes clogged with roots and materials collected thereby.

By the use of m invention, which is an extremely simple evice and of small cost to manufacture, joints in sewer pipes andv similar conduits may be made tight, thereby preventing roots from growing into or through the joints in the pipe section.

In the accompanyin drawings, which illustrate the invention, ike characters indicate like parts throu houtthe several views. v

Referring to the rawings:

Fig. 1 is an elevation of the improved joint-protector applied around the joint of two sewer pipe sections,

Fig. 2 is a .longitudinal central section taken on the line 2 2 of Fig. 3;

through the loop.; and

Fig. 6 is a view corresponding to Fig. 5 with the exception that the strap has been secured to the loop. J

The numeral 7 indicates sewer pipe sections, each having at one end a hub 8 into which the small end of an adjacent pipe section is telesco ed to afford a loose joint therebetween. ement 9 is placed around the joint between the pipe sections .7.

The improved joint-protector is of annular form, segmental in cross section, and

preferably constructed of sheet metal. This annular joint-protector is made u of connected quarter sections adapted to o ned up in the plane of the protector an applied around the cement 9 before the same as set.

The sections 10 are identical, the one with i the other, and, as shown, they are all ressed from sheet metal by the Same die. t and pressed from each section 10, near each end thereof, is atransverse outstanding loop 11. Hinge-acting metal straps 12 are inserted under the loops 11 and their end portions ,y

vbent upon the loops 11 to afford hooks 13 which interlock with said loo `These hinge-acting straps 12 are all ali e and are cut from sheet metal.A To prevent the hooks `one ci? seid straps, erejnserted under the loops il end then bent upon themselves to form the liools 13, These lioolrs i3 connect udjecent sections 1G end hold the :11m-,l in crerle, ping errengeneent with freedom for liinge- 'ke movement so tliut they muy loe opened up, es shown in Fig. 4. After the iointprotector is applied around the cement point 9, tlue reineining free end ont the respectire strep l2 is inserted through the loop ll ori the edjecent section l@ end tlien lient to toene ci the hooks t3, utter the sections l@ here been tightly drawn eround seid joint the nliore description, it is evident thet tlie duplicate sections ,muy loe very quickly essembled end connected ley the duplicate end streps l2,

intense lin u plying the improved joint protector eronn e pipe joint, the cement 9 muy loe placed, either directly on the pipe joint or 1n the sections 10, or some of thee/ement moy be placed directly around the pipe 'joint und the rest of it yin the sections 1.0.

The fastening of the last stre l2 permits -Y circumferential adjustment o' the jointprot'ector for pipe sections which very in diameter loeiore the hook 13 is formed thereon7 to secure seid protector in position.

What l cle is:

l. A protector of the kind described comprising duplicate segmental sections that here overlapping engagement 'that permit circumferential sliding movement or one ot seid sections upon the other, end loose duplicete hinge straps connected' to seid sections.

2.. The structure dencd in cleiin l in which transverse loops ere cut end pressed from the sections .und under r-Vliicli loops c seid strep/s extend end. ere leent et diderent longitudinally spaced points to :torni hooks that edjusteloly connect seid sections.

lin testimony "whereof ll am my signature rnnnnnrcn n'. Minn 

